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        <section id="main"><article id="post-CSS进阶知识点-动画性能优化" class="article article-type-post" itemscope itemprop="blogPost">
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    <a href="/2019/08/19/CSS进阶知识点-动画性能优化/" class="article-date">
  <time datetime="2019-08-19T14:22:03.000Z" itemprop="datePublished">2019-08-19</time>
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      CSS进阶知识点--动画性能优化
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<h1 id="目标"><a href="#目标" class="headerlink" title="目标"></a>目标</h1><p>增强页面渲染性能</p>
<h2 id="CPU-和-GPU"><a href="#CPU-和-GPU" class="headerlink" title="CPU 和 GPU"></a>CPU 和 GPU</h2><p>CPU 即中央处理器，解释计算机指令以及处理计算机软件中的数据</p>
<p>GPU 即图片处理器，专门处理和绘制图形相关的硬件。GPU 是专门执行复杂的数学和几何计算而设计的，有了它，CPU 就从图形处理的任务中解放出来，可以执行其他更多的系统任务</p>
<h2 id="现状"><a href="#现状" class="headerlink" title="现状"></a>现状</h2><p>CSS 的动画、变形、渐变并不会自动的触发 GPU 加速，而是使用浏览器稍慢的软件渲染引擎。</p>
<p>在 transition，transform 和 animation 的世界里，应该卸载进程到 GPU 以加快速度。</p>
<p>只有 3D 变形会有自己的 layer，2D变形不会</p>
<h2 id="translateZ-（or-translate3d-）Hack"><a href="#translateZ-（or-translate3d-）Hack" class="headerlink" title="translateZ()（or translate3d()）Hack"></a>translateZ()（or translate3d()）Hack</h2><p>为元素添加没有变化的 3D 变形，骗取浏览器触发硬件加速</p>
<h2 id="代价"><a href="#代价" class="headerlink" title="代价"></a>代价</h2><p>这种情况通过向它自己的层叠加元素，占用 RAM 和 GPU 存储空间</p>
<h1 id="will-change"><a href="#will-change" class="headerlink" title="will-change"></a>will-change</h1><p>提前通知浏览器元素将要做什么动画，让浏览器提前准备合适的优化设置</p>
<h2 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h2><blockquote>
<p>will-change：auto | scroll-position | contents | <code>&lt;custom-ident&gt;</code> | <code>&lt;animateable-feature&gt;</code></p>
</blockquote>
<h2 id="参数说明"><a href="#参数说明" class="headerlink" title="参数说明"></a>参数说明</h2><table>
<thead>
<tr>
<th>关键字</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>auto</td>
<td>此关键字表示没有特定的意图，适用于它通常所做的任何启发式和优化</td>
</tr>
<tr>
<td>scroll-position</td>
<td>表示将要改变元素的滚动位置</td>
</tr>
<tr>
<td>contents</td>
<td>表示将要改变元素的内容</td>
</tr>
<tr>
<td><code>&lt;custom-ident&gt;</code></td>
<td>明确指定将要改变的属性与给定的名称（最重要）</td>
</tr>
<tr>
<td><code>&lt;animateable-feature&gt;</code></td>
<td>可动画的一些特征值，比如left、top、margin等</td>
</tr>
</tbody></table>
<h2 id="使用注意"><a href="#使用注意" class="headerlink" title="使用注意"></a>使用注意</h2><ul>
<li><p>不能滥用</p>
</li>
<li><p>提前声明</p>
</li>
<li><p>remove</p>
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<p>尽量将 will-change 放在 hover 伪类的父元素里</p>

      
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